SK Hand Tools 19756 6pc 3/8” Dr Metric Ball Hex Bit Socket Set. Features & Benefits: Metric set contains: 3 - 6mm, 8 & 10mm (New Sizes). Sets come attached to a plastic rail packaged in a plastic clam shell. Made of S2 Steel! for improved strength and longer life. Improved Profilated design - No Neck Up!. Metric & Fractional packages shown in photo - Each purchased separately.